AM_Columbite-(Fe)_4 Formula: (Fe.263 Nb.633 Mn.07 Ta.034) O2 Name: Columbite-(Fe) Unit cell: 14.2427 5.729 5.0856 90.0 90.0 90.0 , V=414.97 Space group: PBCN (60)

Tarantino S C , Zema M , American Mineralogist , 90 (2005) p.1291-1300, Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution:, A single-crystal X-ray diffraction study, Sample: BRA n18 Qm=0.618 from S. Jose de Safira, Minas Gerais, Brazil, Note: Occupancies calculated assuming complete Fe/Mn disorder